I bought this book after reading the one previous review. I wanted a refresher as I've been out of real-time embedded systems for several years. While it was easy to read, cover to cover, in only a few days, I was disappointed that it didn't go further.
Most chapters describe one feature of the 8051 microcontroller family and include an example program to make use of it. These build towards the end of the book from a simple "super-loop" into a slightly more sophisticated timer- and event-driven multi-state intruder alarm system with single bit and serial inputs and outputs.
Code for each example is included on the CD, which also contains a copy of the Keil 'C' compiler and its companion 8051 series emulator. These allow you to build each example and play with it without buying any special hardware other than your PC. This is a good introduction to embedded systems development.
However, I was hoping for more depth, or should it be height? There's no multi-tasking here, only a Simple Embedded Operating System, sEOS, that could perhaps be used to replace the controller in your washing machine. It's real-time, but only while you can get everything done in one tick.